445687973 has 4 divisors (see below), whose sum is σ = 445745580. Its totient is φ = 445630368.

The previous prime is 445687969. The next prime is 445688003. The reversal of 445687973 is 379786544.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 207849889 + 237838084 = 14417^2 + 15422^2 .

It is a cyclic number.

It is not a de Polignac number, because 445687973 - 2² = 445687969 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445687943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14990 + ... + 33407.

It is an arithmetic number, because the mean of its divisors is an integer number (111436395).

Almost surely, 2^445687973 is an apocalyptic number.

It is an amenable number.

445687973 is a deficient number, since it is larger than the sum of its proper divisors (57607).

445687973 is an equidigital number, since it uses as much as digits as its factorization.

445687973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57606.

The product of its digits is 5080320, while the sum is 53.

The square root of 445687973 is about 21111.3233360678. The cubic root of 445687973 is about 763.8539080191.

It can be divided in two parts, 4456 and 87973, that added together give a palindrome (92429).

The spelling of 445687973 in words is "four hundred forty-five million, six hundred eighty-seven thousand, nine hundred seventy-three".